FILEIniSet
Set a value to a key. If the key is not found, it will be added.
Prototype :
fun [INIFile S S] I
- INIFile : a ini file Scol object.
- S : a section name and a key name like "section_name:key_name" (':' is the separator)
- S : the value
Return : I 0 if success otherwise nil